code: def test_input_layers_connected(self):
      network = layers.join(layers.Input(1), layers.Input(1))
      self.assertShapesEqual(network.input_shape, (None, 1))
      self.assertShapesEqual(network.output_shape, (None, 1))
  
file_path: neupy/tests/layers/test_input.py
imports: from neupy import layers
  from neupy.exceptions import LayerConnectionError
  from base import BaseTestCase
label_desc: Use image node_id 4 for calling the InputTestCase obj's underlying member method code with example usage: obj.test_input_layers_connected() without return types